Process Valves / Fittings
Pneumatic Seat Valves – Process Valves for Liquids, Gases & Aggressive Media
Pneumatic seat valves switch process media quickly, reliably and with high repeatability – from clean cooling water to acids, alkalis and ultra-pure media. At STASTO Automation you will find a comprehensive range with the pressure-controlled series SE01 to SE25 as well as the special series 21IA.GC and 21IA.GA, covering shut-off, dosing and process applications. Whether 2/2-way shut-off, dosing or aggressive process media: select the right series by connection type, material and nominal bore.
Pressure-Controlled Seat Valves SE01–SE25 & 21IA
Your benefits
Why pneumatic seat valves from STASTO
A wide range of series, clear connection logic and technical support – helping you find the right process valve for your application.
Extensive series range
26 pneumatic seat valve series (SE01–SE25 plus special series 21IA.GC/21IA.GA) cover a wide range of nominal sizes and connection types.
For demanding process media
Versions for liquids, gases and aggressive media; materials and seals selectable by series and medium – tailored to your application.
Clear connection logic
Pipe, bottom and port connections (-RT, -BT, -ST) as well as threaded variants (-GE, -GT) integrate the valve cleanly into your pipeline.
Technical consulting included
Our team assists with selecting the appropriate series based on medium, pressure and temperature requirements, and actuation type.
Series overview
Pneumatic seat valves by connection type
Select the right series by connection type and design – from pipe and bottom connections to nozzle, threaded and special series.
Application Areas
Where pneumatic seat valves are used
STASTO pneumatic seat valves are used wherever media must be switched reliably and with zero leakage.
Chemical & Process Engineering
Shutting off and metering acids, alkalis and aggressive process media; material and seal selection based on media compatibility.
Surface Treatment & Electroplating
Switching and metering aggressive process baths and pickling media where resistant materials and tight shut-off are essential.
Dosing & Filling Applications
As a pneumatic dosing valve for reproducible, fast-switching processes with high purity requirements.
Plant & Machine Building
Wherever a compact, low-leakage process fitting is required as a pneumatic shut-off valve or 2/2-way seat valve.
Pilot Air & Gas Applications
Reliable switching of gases and compressed air with fast, repeatable actuation via pilot air.
Industrial Manufacturing
Process and shut-off duties in production systems where tight switching and a compact design are required.
Buyer's Guide
Choosing the right seat valve
A seat valve seals via a valve disc against a valve seat, providing simple, low-leakage shutoff — ideal for clean to lightly contaminated liquids and gases. For other process profiles, sliding gate valves and pinch valves are available.
Valve type by process profile
- Seat valve
- Seals via valve disc and valve seat — simple, low-leakage shutoff for clean to lightly loaded liquids and gases.
- Sliding gate valve
- The pneumatic sliding gate control valve operates with a sliding sealing surface and is suited to different control and wear profiles.
- Pinch valve
- Pinches off an elastic sleeve — first choice for particle-laden, abrasive or highly aggressive media with no contact to metallic components.
Selection criteria at a glance
- Media
- Neutral, aggressive, particle-laden, gas or liquid — determines material and seal selection.
- Connection type
- Tube (-RT), bottom (-BT), nozzle (-ST) or threaded (-GE/-GT).
- Function
- Pure shutoff (2/2-way) or dosing.
- Actuation
- Pneumatic (control air available) or electric (series SE14–SE17).
- Operating conditions
- Pressure and temperature range vary by series – please refer to the respective datasheet or contact us for the permissible values.
Design Comparison
Seat Valve, Slide Valve & Pinch Valve
Which design suits your process medium? The key differences at a glance.
| Seat Valve | Sliding gate valve | Pinch valve | |
|---|---|---|---|
| Sealing Principle | valve disc against valve seat | sliding sealing surface | elastic tube is pinched shut |
| Suitable Media | clean to lightly loaded liquids & gases | depending on control and wear profile | particulate, abrasive, highly aggressive media |
| Leakage Behaviour | low leakage | depends on design | media contact only at the tube |
| Typical Application | shut-off, dosing, process media | positioning/control | abrasive & aggressive media |
Availability & Inquiry
Scope of Delivery and Availability
Scope of delivery and lead time depend on the selected series and variant. Many versions are available at short notice; special configurations are manufactured to your requirements – please contact us for specific availability per item or variant.
Request Based on Process Data
Please provide us with the medium, nominal diameter, connection type and quantity – we will identify the appropriate series.
Availability per Variant
We will get back to you with availability and lead time for the specific version.
Custom Configurations
Special versions and special series 21IA are manufactured to your specifications.
Framework conditions
For recurring requirements, we are happy to agree on framework terms.
Frequently Asked Questions
FAQ on pneumatic seat valves
Answers to the most important questions about selection, media, and connection types.
What is a pneumatic seat valve?
A pneumatic seat valve is a process valve in which a valve disc is moved against a valve seat by means of control air. This allows a medium to be shut off or released quickly, tightly, and repeatably. STASTO offers pressure-controlled series from SE01 to SE25.
Which media are the seat valves suitable for?
Depending on the series and material specification, they are suitable for liquids, gases, and aggressive media. We will match the right combination of material and seal to your medium – please contact us.
What connection types are available?
Pipe connection (-RT), bottom connection (-BT), nozzle connection (-ST), as well as threaded versions in stainless steel (-GE) and further variants (-GT). The appropriate variant depends on your pipeline.
Are electrically actuated seat valves also available?
Yes. For applications without available control air, we stock electrically actuated seat valves in series SE14 to SE17 as a separate category.
How do I find out the pressure/temperature range and delivery time?
These values depend on the specific series and variant. We will provide you with the permissible operating data and availability on request or based on the datasheet of the specific model.
What is the difference between a seat valve and a ball valve or diaphragm valve?
The seat valve seals via disc and seat, making it exceptionally low-leakage. Ball valves and diaphragm valves cover different construction and wear profiles. We are happy to advise you on the right type.
Related Types
Suitable Alternatives and Supplements
Depending on the process configuration and actuation type, these categories complement the pneumatic seat valve range.
Advice & Selection
Find the right pneumatic seat valve for your application
Tell us the medium, nominal size, and connection type – our technical team will recommend the appropriate series from the STASTO range and provide availability and lead time.